Section 91(4)(a) in The Dock Workers (Safety, Health And Welfare) Regulations, 1990
(a)collapse or failure of lifting appliances or conveyors or breakage or failure of ropes, chains or other loose gears and lifting devices or overturning of cranes, used in dock work, falling of headboards or cargo from slings, displacement of hatch beam resulting in the fall of hatch beams or coverings;